Ryo Kikuchi

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Recently, several efforts to implement and use an unconditionally secure multi-party computation (MPC) scheme have been put into practice. These implementations are passively secure MPC schemes in which an adversary must follow the MPC schemes. Although passively secure MPC schemes are efficient, passive security has the strong restriction concerning the(More)
We provide a garbling scheme which creates garbled circuits of a very small constant size (four bits per gate) for circuits with fan-out one (formulas). For arbitrary fan-out, we additionally need only two ciphertexts per additional connection of each gate output wire. We make use of a trapdoor permutation for which we define a generalized notion of(More)
In this paper we propose the use of intra-body communication (IBC) for a personal health monitoring system employing inexpensive, lightweight, miniature sensor platforms. Body area networks (BANs) with physiological sensors will improve current healthcare services and at the same time significantly reduce costs to public health systems. We are primarily(More)
We develop an algorithm to optimize routing and channel assignment for multi-channel wireless mesh networks. We apply our proposed algorithm to a cognitive radio system using TV white space channels, which has been developed in previous researches. To maximize the capacity and throughput of such multi-channel mesh networks, conventional algorithms(More)